Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
  • G01S17/74—Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
  • G01S7/499—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using polarisation effects
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
  • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
  • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
  • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
  • G01S13/765—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted with exchange of information between interrogator and responder
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
  • G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects

Definitions

• the invention relates to a detection assembly (coding, reading and identification of information.
• This assembly is composed of a transmitter (0 emitting electromagnetic signals (2), an inert modulator (, modulated electromagnetic signals ( 4) and a receiver (5).
• This assembly operates in the following manner, (1) emits signals (2), (3) receives the signals (2) and modulates the signal to indicate a coded message therein and returns modulated electromagnetic signals (4), (5) receives them (and forwards them for use).
• This invention allows information to be coded and identified.
• the message to be identified is coded in a predefined manner according to an arrangement and dimensioning of elements.
• the identification of the message can be carried out at distances varying from 0 to several hundred meters and in an automated manner whatever the climatic conditions.
• the modulation of the signals according to a message is carried out with passive elements.
• This invention has the advantage of detecting and identifying information of the traffic signal for a mobile vehicle, for example- Today, before the number of fatalities, try to reduce these collisions by increasing efficiency of the perception of road signs.
• This is an object of the present invention. Many factors reduce this reading and this identification in road driving.
• the high speed, the darkness of the night and the fog, the strong glare of the sun, the visual acuity and the tiredness of the driver are elements which decrease the effectiveness of the identification of the information of the road signs.
• This invention installed in a road vehicle, associated with a driving or navigation assistance system, makes it possible to detect traffic information and to indicate it to the driving assistance system which, thanks to man-machine interfaces. heads high or low indicate the information of road signs visually and / or audibly.
• This invention makes it possible to identify the road signs correctly and reliably when driving under normal conditions as well as under extreme conditions of speed, darkness, glare even if the driver is tired; an audible signal allows the driver's attention to be rekindled
• radios and sound provide information for road signs.
• the number of radio transmitters and noise is very low at the number of road inert visual signs. This is because it is inconceivable to associate a source of energy for each panel for emitting a radio or audio information.
• the present invention solves the problem of correct identification information in an automated manner through a passive device (3) (working without energy) associated with the road visual panel and a transmitter (1), electromagnetic signals (2) and modulated electromagnetic signals (4) and a receiver (5).
• the reliable automated identification whatever the circumstances, is then provided.
• the present invention can be associated with the vehicle's on-board computing and its human-machine interfaces.
• the invention associated with a navigation system increases the efficiency thereof. For example, the invention can indicate a direction taken at a crossroads, when there is a direction error and the navigation system can then indicate it to the driver of the vehicle.
• the transmitter (1) and the receiver (5) are always linked, they are synchronized.
• (1) and (5) can be mobile in an embedded system, and (3) can be fixed, or mobile.
• (1) and (5) can be fixed and (3) can be fixed or mobile.
• the invention consists in emitting electromagnetic pulses of different wavelengths (2). These electromagnetic waves are emitted with random elliptical polarizations not defined (as in white light). These electromagnetic waves (2) of different lengths will reach the modulator (3). First focused inside the modulator, some pulses will be absorbed and other linearly polarized in a certain way, then thoughtful. The absorption of certain wavelengths and the polarization, reflection of the non-absorbed wavelengths are carried out according to a coding of the information to be transmitted. Then, the wavelengths polarized rectilinearly (in a way) and reflected (4) return on the receiver (5), which detects the wavelengths returned as well as their state of polarization.
• a decoding of the absence of the wavelengths and of the polarization states makes it possible to indicate an identification code of the panel. Then, the receiver (3), the decoder (6) and the transcriptionist (7) can transmit the information to the on- board computer of the vehicle (for processing with the driving assistance system, or else with the system of navigation aid).
• Drawing 1/10 present the invention in the road sector.
• Drawing 2/10 shows the invention in the organization of an automobile.
• Drawing 3/10 presents the invention in the railway field.
• 4/10 The drawing shows the invention in the maritime field.
• Drawing 5/10 present the invention in the industrial field and robotisation
• the drawing 6/10 and 7/10 have a modulator.
• the drawings 8/10 and 9/10 and 10/10 show schematically the operation of the modulation of signals without energy in the modulator.
• the control / command system (0) clocked by a time base controls the transmitter (1).
• the transmitter (1) consisting of maser, laser emits a number of electromagnetic pulses of different wavelengths for an instant.
• the numbers of pulses and wavelengths are not limiting. They are a function of coding.
• the transmitter (1) emits n electromagnetic pulses of wavelength ⁇ where ke [l, n] and Vi, j; ⁇ . ⁇ ⁇ . .
• the electromagnetic wavelength range is not limiting, however a comfortable range of use for the invention is 1 ⁇ m. at 100 ⁇ m. [Similarly, the application of the invention present in the field of road signs is 3 ⁇ m.
• the emitter lasers (1) are made from semi-conductive structures made of Gallium Arsenide and / or Gallium Alumina Arsenide and / or Gallerie Arsenide Phosphorus Indinium and / or in Arsenide of Fallin of Indinium and / or in Cadmium Tellurium and / or in Mercury Cadmium Tellurium and / or based on crystals like the crystalline structures of Neodymium. These compounds are not limiting to the present invention for use. These masers and lasers are part of the state of the art. These are known structures.
• the transmitter (1) emits n electromagnetic pulses of wavelength ⁇ k from n lasers.
• the modulator (3) is composed of different network structures and / or beeps and / or stacks of thin layers (Bragg mirror) and / or mirrors and / or lenses (convergent and / or divergent) and / or polarizers and / or surface polaritons.
• the transmitter emits 4 electromagnetic pulses of wavelengths 3; 4.2; 5.6; 7 ⁇ m. randomly polarized elliptically. We want to modulate these electromagnetic pulses by absorbing the wavelength 5.6 ⁇ m.
• the electromagnetic radiation reaches the lens Lj (convergent) see figure 12.
• the external electromagnetic pulses are focused inside the modulator (3), see figure 13.
• a metallic network R ⁇ by reflection of not 1.3 ⁇ m. with sinusoidal profile and / or a beep with 1.3 ⁇ m holes. diameter and 120 ° solid angle.
• the R network diffracts wavelengths angularly depending on the wavelength of the incident wave, see Figure 14.
• the absorber is a Bragg mirror, it is made up of stacks of thin layers with thicknesses multiples of the absorbing wavelength.
• the electromagnetic radiation incident to the absorber varies in the different layers and by interference destructive, the radiation is absorbed.
• These absorbent structures are part of the state of the art.
• these absorbent structures are not limited to the Bragg mirror. Unabsorbed electromagnetic radiation like ⁇ - ,, ⁇ 2 and ⁇ ⁇ will reach polarizers P x , P 2 , P 4 .
• the polarizers can be rhombohedral crystal structures of calcium carbonate like calcite quartz. These structures are not limiting, we can also use periodic structures like surface polaritons. Polaritons are not the subject of the present invention, they are part of the state of the art.
• the physical arrangement, geometric orientation of the polarizers with respect to each other makes it possible to introduce angular differences between the wavelengths polarized rectilinearly.
• the polarized wavelengths are then collected by mirrors (see figure 15) and the lens L 2 (see figure 16) which transmits the electromagnetic pulses (4) outside the modulator (3) (see figure 17).
• the wavelengths (4) will reach the receiver (5).
• the receiver (5) picks up the wavelengths (4), and determines the wavelengths of electromagnetic radiation by means of semiconductor structures of the charge coupled device type. Then a polarimeter measuring the angular deviations of linear polarization between wavelengths.
• the polarimeter and the semiconductor structures of the charge coupled device type are not the subject of the present invention, they are part of the state of the art.
• the detection of wavelengths is not limited to the use of charge coupled device type structures.
• the detection of polarization states is not limited to the use of the polarimeter. Wavelengths and polarization differences are transmitted to the signal decoder. If straight non-polarized wavelengths reach the receiver (5), these are not transmitted to the signal decoder.
• This signal decoder (6) having received signals of wavelength and signals of angular deviations between the rectilinear polarizations; and being synchronized with the control / command (0), transmits identified signals to the transcriptionist signals (7) which formats them in order to introduce them on the computer data bus.
• the identification data are then managed by a priority management computer program (8). This, depending on the identification, transmits it to an alarm or for use.
• the invention In the situation of road traffic, if the invention detects a prohibited parking sign, it will then be classified with low priority and will be indicated to the driver, only if the driver wishes to park, which the mechanical components (12 ) may indicate to the driver assistance system. While the invention will alert the driver of the prohibition via the interface (11). Similarly, if the invention identifies a prohibited direction sign, then the priority manager classifies the identification as a high priority and indicates it directly to the driver by the driving assistance system (14) and the interface ( 11). Similarly, if the invention identifies a direction, then the priority management program (8) classifies the identification according to the operating mode of the navigation aid system in order to transmit it to the navigation aid system. (16) which makes it possible to locate the on-board system, and / or to indicate it to the driver using the interface (11).

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Computer Networks & Wireless Communication (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Electromagnetism (AREA)
• Optical Communication System (AREA)
• Traffic Control Systems (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=9502448

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (7)

• 1997
  • 1997-01-03 FR FR9700124A patent/FR2758190B1/fr not_active Expired - Fee Related
• 1998
  • 1998-01-02 EP EP98901365A patent/EP0907896A1/de not_active Withdrawn
  • 1998-01-02 WO PCT/FR1998/000001 patent/WO1998029761A1/fr not_active Ceased

Non-Patent Citations (1)

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